It's when a boss kills his own henchmen to let you know that he means business.

Poor henchmen. They've been so loyal to their boss and he rewards them by killing them. Usually this is a result of the fact that the boss is so huge that he destroys anything in his path. Sometimes it's to show his force, to tell you that he means business. Sometimes he even uses his henchmen to try to kill you by using them as clubs or throwing them. When the boss kills his henchmen, he's only doing the player a favor, since you won't have to deal with them.

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